CPM Homework Help : PC3 Problem 6-113

Periodic curve, x axis scaled from negative 2 pi to 2 pi, with 4 visible turning points at (negative 7 fourths pi, comma negative 1), (negative 3 fourths pi, comma 3), (1 fourth pi, comma negative 1), & (5 fourths pi, comma 3). Using the smallest possible horizontal shift, write an equation for the graph to the right in terms of:

sine
Hint (a):
Draw in the midline and maximum and minimum boundary lines. Then determine the amplitude, period, and shifts.
cosine